The concept of an objective spatial direction in special relativity is investigated and theories assuming light-speed isotropy while accepting the existence of a privileged spatial direction are classified, including so-called very special relativity. A natural generalization of the proper time principle is introduced which makes it possible to devise non-optical experimental tests of spatial isotropy. Several common misunderstandings in the relativistic literature concerning the role of spatial isotropy are clarified. © 2011 Springer Science+Business Media, LLC.
CITATION STYLE
Mamone Capria, M. (2011). Spatial Directions, Anisotropy and Special Relativity. Foundations of Physics, 41(8), 1375–1397. https://doi.org/10.1007/s10701-011-9554-3
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